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Operation
(PC88MR-J6B3-044-K-00-A)
When circuit pressure is (P0)
The relief valve does not operate.
When the circuit pressure rises abruptly
When circuit pressure reaches (P1), pressure acts on the area difference between (D1) and (D3) [(D1 >
(D3)], and oil presses spring (4), thus valve (3) starts opening.
At this time, pressure acts on the area difference between (D1) and (D2) [(D2) > (D1)], thus seat (1)
follows valve (3).
The relief passage to port (S) for the oil in chamber (a) compressed by movement of seat (1) is narrowed
by ball (2), thus seat (1) moves slower than valve (3).
Accordingly, the relief pressure increases gradually from (P1) to (P2) until seat (1) reaches sleeve (5).
PC88MR-10
10 Structure and function
Swing motor
10-115
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Troubleshooting
